The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 44 |
| 3 | 361 |
| 4 | 2010 |
| 5 | 7952 |
| 6 | 25401 |
| 7 | 68662 |
| 8 | 164459 |
| 9 | 357241 |
| 10 | 718934 |
| 11 | 1357271 |
| 12 | 2431460 |
| 13 | 4164014 |
| 14 | 6864051 |
| 15 | 10942908 |
| 16 | 16946805 |
| 17 | 25576479 |
| 18 | 37731200 |
| 19 | 54532437 |
| 20 | 77381198 |
| 21 | 107985724 |
| 22 | 148434413 |
| 23 | 201227282 |
| 24 | 269366687 |
| 25 | 356392309 |
| 26 | 466492202 |
| 27 | 604540771 |
[1,3,44,361,2010,7952,25401,68662,164459,357241, 718934,1357271,2431460,4164014,6864051,10942908, 16946805,25576479,37731200,54532437,77381198, 107985724,148434413,201227282,269366687,356392309, 466492202,604540771] |